Not all people who have pigmentary dispersion develop glaucoma. Pigmentary dispersion is a disorder in which some pigment granules leak out of the iris. The granules may clog the trabecular meshwork, preventing the normal aqueous outflow. This in turn causes an increase in intraocular pressure, which may lead to glaucoma. It is impossible to know for sure which individuals with pigmentary dispersion will develop glaucoma, so it is particularly important for you to have regular medical eye exams.